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  4. CVE 2026 18526 humhub 1184 1184 pl1 stored cross site scripting
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Back to active CVEs
High · CVSS 7.4CVE-2026-18526

HumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in oEmbed confirmation

Answer in brief

CVE-2026-18526 records a High severity (CVSS 7.4) vulnerability in HumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in oEmbed confirmation. The current sources do not mark it as known exploited. The current feed maps HumHub/HumHub (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Aug 28, 2026Source checked Oct 3, 2026First seen by HOL Aug 19, 2026Material review Aug 28, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps HumHub/HumHub (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
HumHub/HumHubgeneric1.18.4Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for HumHub/HumHub.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Aug 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 19, 2026

Sources and claim methodology

  • Source referencefluidattacks.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in the oEmbed confirmation rendering workflow.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • WordPress Unlimited Elements For Elementor (Free Widgets, Addons, Templates) plugin <= 2.0.20 - Cross Site Scripting (XSS) vulnerabilityAlso CWE-79
  • WPMobile.App <= 11.84 - Unauthenticated Stored Cross-Site Scripting via '/android_json/search/<value>/0' Path SegmentAlso CWE-79
  • WPC Estimated Delivery Date for WooCommerce <= 4.0.1 - Reflected Cross-Site Scripting via 'rule_data' ParameterAlso CWE-79
  • OpenAM before 16.1.3 Reflected XSS via OAuth2 Authorization Error PageAlso CWE-79
  • OpenAM before 16.1.3 Latent XSS in SAML Load-Balancer Cookie Bounce PageAlso CWE-79
  • Responsive Plus <= 3.5.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode AttributesAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 3, 2026
References
3 linked sources
Open source record