Medium Cross-site scripting

CVE-2026-116139 — WWBN AVideo 26.0 through 29.3.0 Stored XSS via Comment Markdown Rendering

WWBN AVideo 26.0 through 29.3.0 contains a stored cross-site scripting vulnerability that allows authenticated commenters to inject JavaScript because markDownToHTML() preserves event-handler attributes in leading HTML blocks. Attackers can post a comment starting with an img tag carrying an onerror handler, which bypasses the inline sanitizer and executes in viewers' browsers under the application origin.

Published Oct 25, 2026 · Updated Oct 26, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: VulnCheck

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2
Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.23%

ahead of 13% of scored CVEs · Oct 27, 2026

Affects

Wwbn

Avideo

CVSS base

5.4

Medium · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Wwbn Avideo).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Exploitation requires user interaction: tighten email/web filtering and warn affected users.
Search available logs for exploit probes matching the vulnerability class (cross-site scripting), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Wwbn	Avideo	≥ 26.0 and ≤ 29.3.0	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
5.1	CVSS 4.0	Medium	—	—	disclosure@vulncheck.com via NIST National Vulnerability Database
5.1	CVSS 4.0	Medium	—	—	VulnCheck via CVE Program (cve.org) e CISA ADP
5.4	CVSS 3.1	Medium	2.3	2.7	disclosure@vulncheck.com via NIST National Vulnerability Database
5.4	CVSS 3.1	Medium	—	—	GitHub, Inc. via GitHub Security Advisories
5.4	CVSS 3.1	Medium	—	—	VulnCheck via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N (score shown at the top: disclosure@vulncheck.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-79 · Cross-site Scripting (XSS)

Other CVEs with this weakness →

EPSS over time FIRST

Oct 26, 2026 → Oct 27, 2026 · 2 reading(s) · max 0.23%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Monitor CSP violation reports and script payloads in reflected parameters.

web/proxy/WAF logsnetwork IDS/IPSapplication logs

Timeline

What happened to this CVE, newest first.

2026
SSVC assessment updated
Oct 26, 2026 · CVE Program (cve.org) e CISA ADP
Affected products added · wwbn/avideo
Oct 25, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 25, 2026
CVSS changed · 5.4
Oct 25, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 25, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 25, 2026 · Alertas do Telegram
CVE published
Oct 25, 2026 · VulnCheck

Source activity

Repeated readings are counted rather than listed.

2× References added · Oct 25, 2026 – Oct 26, 2026
1× Official description updated · Oct 25, 2026 – Oct 25, 2026

References

5 on the record

github.com/WWBN/AVideo/commit/f13587c59346b4bf0f449273021d29b869594559
patch, NIST National Vulnerability Database
github.com/WWBN/AVideo/security/advisories/GHSA-cx46-26xc-2w7f
vendor-advisory, NIST National Vulnerability Database
github.com/advisories/GHSA-r52j-79hv-6mmf
GitHub Security Advisories
nvd.nist.gov/vuln/detail/CVE-2026-116139
GitHub Security Advisories
www.vulncheck.com/advisories/wwbn-avideo-26.0-through-29.3.0-stored-xss-via-comment-mar
third-party-advisory, NIST National Vulnerability Database

Elsewhere on this site

Wwbn
every CVE for this vendor

Cross-site scripting
same class

CWE-79
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-116800 WWBN AVideo before 29.5.0 Local PHP File Inclusion via Accept-Language Header 1d
Medium CVE-2026-114633 WWBN AVideo before 29.4.0 Incorrect Authorization via confirmDeleteUser.json.php 6d
Medium CVE-2026-114634 WWBN AVideo before 29.4.0 Blind SSRF via getHeaderContentTypeFromURL Redirect 6d
Low CVE-2026-114048 WWBN AVideo before 24.0 CSRF via Legacy Playlist and Video Endpoints 7d
High CVE-2026-105086 WWBN AVideo 12.4 through 29.2.0 Stored XSS via Double-Encoded Video Title 23d
High CVE-2026-105089 WWBN AVideo through 29.2.0 Stored XSS via trailer1 in YouPHPFlix2 Templates 23d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-116139 is "WWBN AVideo 26.0 through 29.3.0 Stored XSS via Comment Markdown Rendering", rated Medium. It affects Avideo (Wwbn); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.4 describes technical severity. EPSS 0.23% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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