Low Cross-site scripting exploit reference

CVE-2026-103686 — rhukster dom-sanitizer URL Validation DOMSanitizer.php isDangerousUrl cross site scripting

A flaw has been found in rhukster dom-sanitizer up to 1.0.15. Impacted is the function DOMSanitizer::isDangerousUrl of the file src/DOMSanitizer.php of the component URL Validation. This manipulation causes cross site scripting. It is possible to initiate the attack remotely. The exploit has been published and may be used. Upgrading to version 1.0.16 is recommended to address this issue. Patch name: 4623b565d060bc02ca5a07d8c8241fe28e2edfda. It is suggested to upgrade the affected component.

Published Oct 1, 2026 · Updated Oct 16, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulDB

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 0.4% (30-day exploitation probability)+4
CISA SSVC: exploitation "poc"+5

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

0.37%

ahead of 29% of scored CVEs · Oct 15, 2026

Affects

Rhukster

Dom-sanitizer

CVSS base

3.5

Low · 2 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

Proof of concept

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 (Rhukster Dom-sanitizer).
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
Rhukster	Dom-sanitizer	version 1.0.0version 1.0.1version 1.0.2version 1.0.3version 1.0.4version 1.0.5version 1.0.6version 1.0.7 and 8 more version 1.0.8version 1.0.9version 1.0.10version 1.0.11version 1.0.12version 1.0.13version 1.0.14version 1.0.15	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

Unchanged

Confidentiality

None

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	—	—	VulDB via CVE Program (cve.org) e CISA ADP
2.0	CVSS 4.0	Low	—	—	cna@vuldb.com via NIST National Vulnerability Database
3.5	CVSS 3.1	Low	2.1	1.4	cna@vuldb.com via NIST National Vulnerability Database
3.5	CVSS 3.1	Low	—	—	VulDB via CVE Program (cve.org) e CISA ADP
3.5	CVSS 3.0	Low	—	—	VulDB via CVE Program (cve.org) e CISA ADP
4.0	CVSS 2.0	Medium	8.0	2.9	cna@vuldb.com via NIST National Vulnerability Database
4.0	CVSS 2.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP

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

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-79 · Cross-site Scripting (XSS)

Other CVEs with this weakness →

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
Affected products added · rhukster/dom-sanitizer
Oct 16, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 16, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 3.5
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Oct 1, 2026 · VulDB

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

github.com/rhukster/dom-sanitizer/commit/4623b565d060bc02ca5a07d8c8241fe28e2edfd
patch, NIST National Vulnerability Database
github.com/rhukster/dom-sanitizer/releases/tag/1.0.16
patch, NIST National Vulnerability Database
vuldb.com/vuln/412550
vdb-entry, technical-description, NIST National Vulnerability Database
vuldb.com/submit/958312
third-party-advisory, NIST National Vulnerability Database
vuldb.com/cve/CVE-2026-103686
third-party-advisory, NIST National Vulnerability Database
github.com/rhukster/dom-sanitizer/
product, NIST National Vulnerability Database
vuldb.com/vuln/412550/cti
signature, permissions-required, NIST National Vulnerability Database
github.com/rhukster/dom-sanitizer/security/advisories/GHSA-mrpv-6x26-mf6c
exploit, NIST National Vulnerability Database

Elsewhere on this site

Rhukster
every CVE for this vendor

Cross-site scripting
same class

CWE-79
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-103687 rhukster dom-sanitizer SVG Sanitization DOMSanitizer.php url incomplete blacklist 14d
Medium CVE-2026-100370 DOMSanitizer - Incomplete data: URL Sanitization in DOMSanitizer::isDangerousUrl() Allows Base64-Encoded Payloads to Bypass href and xlink:href Validation 17d
Medium CVE-2026-40301 rhukster/dom-sanitizer: SVG <style> tag allows CSS injection via unfiltered url() and @import directives Apr 17, 2026

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-2026-103686 is "rhukster dom-sanitizer URL Validation DOMSanitizer.php isDangerousUrl cross site scripting", rated Low. It affects Dom-sanitizer (Rhukster); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 3.5 describes technical severity. EPSS 0.37% 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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