Apache Software Foundation vulnerabilities

CVE-2026-34033 Medium · 5.4 CWE-79 Jun 9, 2026

Apache Answer: HTML Content Injection in Email

Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Apache Answer. This issue affects Apache Answer: through 2.0.0. User-supplied content was included in notification emails without proper escaping, allowing authenticated users to inject arbitrary HTML into emails sent to other users. Users are recommended to upgrade to version 2.0.1, which fixes the issue.

CVE-2026-34031 Medium · 6.5 CWE-434 Jun 9, 2026

Apache Answer: The custom avatar was not properly validated

Unrestricted Upload of File with Dangerous Type vulnerability in Apache Answer. This issue affects Apache Answer: through 2.0.0. The server did not sufficiently validate user-supplied image URLs, allowing arbitrary external content to be embedded as profile images, which could expose users to unintended external requests and tracking by third-party servers. Users are recommended to upgrade to version 2.0.1, which fixes the issue.

CVE-2026-33582 Medium · 6.5 CWE-434 Jun 9, 2026

Apache Answer: Uploading specially crafted TIFF files causes an Out-of-Memory error

Unrestricted Upload of File with Dangerous Type vulnerability in Apache Answer. This issue affects Apache Answer: through 2.0.0. A crafted TIFF image could trigger excessive memory allocation during image decoding, allowing an authenticated user to cause the server process to crash. Users are recommended to upgrade to version 2.0.1, which fixes the issue.

CVE-2026-25699 Medium · 6.1 CWE-359 Jun 9, 2026

Apache Answer: Authorization Bypass in Timeline API

Exposure of Private Personal Information to an Unauthorized Actor vulnerability in Apache Answer. This issue affects Apache Answer: through 2.0.0. Timeline-related APIs lacked proper authorization checks, allowing regular authenticated users to access deleted, private, or unapproved content and its revision history. Users are recommended to upgrade to version 2.0.1, which fixes the issue.

CVE-2026-25688 Medium · 6.1 CWE-87 Jun 9, 2026

Apache Answer: XSS in AI Answer Rendering

Improper Neutralization of Alternate XSS Syntax vulnerability in Apache Answer. This issue affects Apache Answer: through 2.0.0. AI-generated response content was rendered in the browser without proper sanitization, allowing malicious scripts to be executed when the content was viewed. Users are recommended to upgrade to version 2.0.1, which fixes the issue.

CVE-2026-49975 High · 7.5 CWE-789 Jun 8, 2026

Apache HTTP Server: mod_http2 denial of service

Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.

CVE-2026-48913 High · 7.3 CWE-416 Jun 8, 2026

Apache HTTP Server: mod_http2 memory corruption when file handles exhausted

Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already exhausted. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.67.

CVE-2026-44631 Critical · 9.8 CWE-124 Jun 8, 2026

Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow

Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

CVE-2026-44186 High · 7.3 CWE-835 Jun 8, 2026

Apache HTTP Server: Loop in `proxy_ftp_handler` in mod_proxy_ftp

Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache HTTP Server with an attacker controlled backend FTP server. This issue affects undefined: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

CVE-2026-44185 High · 7.3 CWE-126 Jun 8, 2026

Apache HTTP Server: Stack Buffer Over-Read in mod_ssl OCSP `send_request`

Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled OCSP server This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

CVE-2026-44119 Medium · 5.5 CWE-269 Jun 8, 2026

Apache HTTP Server: escalation of privilege through expressions in .htaccess in multiple modules

Improper Privilege Management vulnerability in Apache HTTP Server 2.4.67 and earlier allows local .htaccess authors to read files with the privileges of the httpd user. This issue affects Apache HTTP Server: from through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

CVE-2026-43951 Medium · 6.5 CWE-125 Jun 8, 2026

Apache HTTP Server: OOB Read in `merge_response_headers` can cause crash

Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response languages. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

CVE-2026-42536 High · 7.5 CWE-122 Jun 8, 2026

Apache HTTP Server: mod_xml2enc heap overflow

Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

CVE-2026-42535 Critical · 9.1 CWE-668 Jun 8, 2026

Apache HTTP Server: mod_dav_fs protected directory access

A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to directly manipulate trusted DAV property databases, potentially causing child process crashes. Users are recommended to upgrade to version 2.4.68, which fixes this issue.

CVE-2026-34356 High · 7.5 CWE-122 Jun 8, 2026

Apache HTTP Server: ProxyPassReverseCookieMap buffer overflow

Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie* This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

CVE-2026-34355 High · 7.5 CWE-122 Jun 8, 2026

Apache HTTP Server: mod_proxy_html buffer overflow

A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an untrusted backend. Users are recommended to upgrade to version 2.4.68, which fixes this issue.

CVE-2026-29170 Medium · 6.1 CWE-79 Jun 8, 2026

Apache HTTP Server: mod_proxy_ftp XSS

A cross-site scripting vulnerability exists in mod_proxy_ftp's HTML directory list generation in Apache HTTP Server 2.4.67 and earlier when listing FTP directory contents either via forward or reverse proxy configuration. Users are recommended to upgrade to version 2.4.68, which fixes this issue.

CVE-2026-29167 Critical · 9.8 CWE-416 Jun 8, 2026

Apache HTTP Server: mod_ldap per-dir use-after-free

Use After Free vulnerability in Apache HTTP Server with mod_ldap in per-directory configuration This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

CVE-2026-47430 High · 7.5 CWE-20 Jun 8, 2026

Cordova Plugin InAppBrowser: iOS: Arbitrary Cordova callback IDs can be dispatched without validation from InAppBrowser WebViews

## Summary The iOS implementation of `cordova-plugin-inappbrowser` passes the `id` field from a `WKScriptMessage` body to `commandDelegate sendPluginResult:callbackId:` with no format validation (`CDVWKInAppBrowser.m:560–574`). Any web content loaded inside the InAppBrowser can fire any pending Cordova callback in the host app by posting a message whose `id` field is a guessable or enumerated callback identifier. An attack abusing this weakness must be tailored to the specific plugins and callback IDs the host app uses. Though an attacker with knowledge of common Cordova plugin configurations could craft reusable payloads targeting widely-adopted plugins. ## Impact An unauthenticated remote attacker who controls content displayed in the InAppBrowser — via a URL the app opens (OAuth redirect, marketing link, deep-link target) or a network interception — can call `window.webkit.messageHandlers.cordova_iab.postMessage({id: '<victim-callback-id>', d: '...'})` to fire callbacks belonging to any other installed Cordova plugin (Camera, Contacts, File, Geolocation). Cordova callback IDs follow the predictable format `<PluginName><sequential-integer>`, making enumeration feasible. Successful exploitation allows the attacker to spoof plugin results across trust boundaries — for example, injecting a forged camera approval, a fabricated contacts list, or a crafted file-read response. This issue affects Cordova Plugin InAppBrowser: from 3.1.0 through 6.0.0. Users are recommended to upgrade to version 6.0.1, which fixes the issue.

CVE-2026-50076 Critical · 9.1 CWE-502 Jun 4, 2026

Apache Fory: Java ReplaceResolverSerializer deserialization checks bypass

Deserialization of Untrusted Data in the Java replace-resolve path in Apache Fory fory-core Java SDK before 1.1.0 on Java/JVM platforms allows a remote attacker to bypass class registration, TypeChecker, and DisallowedList checks and invoke classpath-present readResolve/readExternal hooks via crafted Fory serialized data. Users are recommended to upgrade to version 1.1.0 or later, which fixes this issue.

CVE-2026-47065 Critical · 9.8 CWE-502 Jun 3, 2026

Apache MINA: Critical Deserialization Allow-list Bypass via resolveProxyClass - ZDRES-232

ZDRES-232: resolveProxyClass Not Overridden - acceptMatchers Filter Bypass via java.lang.reflect.Proxy Assessment: Fully addressed. When the serialised stream contains a TC_PROXYCLASSDESC (the marker for a java.lang.reflect.Proxy ), JDK’s ObjectInputStream.readProxyDesc() is dispatched. JDK then calls the default ObjectInputStream.resolveProxyClass(interfaces) implementation, which performs Class.forName(intf, false, latestUserDefinedLoader()) for EACH interface name and constructs the proxy class â€” bypassing the accepted classes list . ZDRES-233: Class.forName(name, initialize=true, classLoader) in readClassDescriptor Triggers Static Initialiser of Allow-Listed Classes Assessment: Fully addressed. For ANY class on the allow-list, deserialising a stream that names it triggers the class’s (static initialiser) BEFORE any instance is constructed. This means an attacker who supplies a class name on the allow-list (e.g., the developer wrote accept(“com.myapp.*") , attacker supplies com.myapp.SomeClass ) causes <clinit> of SomeClass â€” and many real-world classes have side-effecting static initialisers Both issues have been fixed.

CVE-2026-46718 Medium · 6.5 CWE-470 Jun 2, 2026

Apache Calcite: A user-controled model can load arbitrary classes, leading to code execution

Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Calcite. This issue affects Apache Calcite: from 1.5.0 before 1.42. Users are recommended to upgrade to version 1.42, which fixes the issue.

CVE-2026-41115 Medium · 4.3 CWE-285 Jun 2, 2026

Apache Kafka: Improper Authorization in CONSUMER_GROUP_DESCRIBE API

An improper authorization vulnerability has been identified in Apache Kafka. The implementation of the CONSUMER_GROUP_DESCRIBE (69) API validates the DESCRIBE operation on the GROUP resource instead of the READ operation that documented in the official kafka documentation and the KIP-848. This discrepancy can result in misconfigured Access Control Lists (ACLs) and unintended security postures, like granting READ permission to users who should not be able to join/sync groups, or allowing users without READ permission (but with DESCRIBE permission) to access sensitive group metadata. The correct permission for CONSUMER_GROUP_DESCRIBE API is DESCRIBE GROUP so the current implementation is correct. However, the kafka documentation as well as the KIP-848 will be updated to reflect the correct permission. We advise the Kafka users to review existing group ACLs to ensure the principle of least privilege.

CVE-2026-49328 Medium · 5.3 CWE-918 Jun 1, 2026

Apache Fesod is vulnerable to Server-Side Request Forgery through its UrlImageConverter component

Server-Side Request Forgery (SSRF) in the UrlImageConverter component of Apache Fesod (Incubating) fesod-sheet before 2.0.2-incubating allows attackers to cause outbound network requests to internal or otherwise restricted resources via a user-supplied image URL. Users are recommended to upgrade to version 2.0.2-incubating, which fixes this issue.

CVE-2026-49361 High · 7.5 CWE-400 Jun 1, 2026

Apache Fluss Netty Frame Decoder Memory Exhaustion Vulnerability

Apache Fluss versions prior to 0.9.1 configure the Netty LengthFieldBasedFrameDecoder with Integer.MAX_VALUE as the maximum frame length, allowing unauthenticated remote attackers to exhaust JVM heap memory on TabletServer and CoordinatorServer by sending specially crafted frame headers, resulting in denial of service. This issue affects Apache Fluss (incubating): 0.8.0 and 0.9.0. Users are recommended to upgrade to version 0.9.1, which fixes the issue.