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PatchSiren cyber security CVE debrief

CVE-2025-63082 Joomla! Project CVE debrief

A lack of input filtering in Joomla leads to an XSS vector in the HTML filter code related to data URLs in img tags. This CVE was published on 2026-01-06T17:15:44.590Z and was last modified on 2026-09-30T23:10:00.237Z. Defenders and administrators of Joomla installations, particularly those using versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2, should assess exposure and prioritize patching. The vulnerability exists due to inadequate content filtering for data URLs in img tags, leading to an XSS vector. This affects Joomla versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2. Defenders should prioritize verifying and applying patches for Joomla versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2. The CVE-

Vendor
Joomla! Project
Product
Joomla! CMS
CVSS
MEDIUM 5.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-06
Original CVE updated
2026-09-30
Advisory published
2026-01-06
Advisory updated
2026-09-30

Who should care

Defenders and administrators of Joomla installations, particularly those using versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2, should assess exposure and prioritize patching.

Why it matters

Defenders should care about CVE-2025-63082 because it allows for XSS attacks through data URLs in img tags in Joomla versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2. The vulnerability requires verification and patching to prevent potential cross-site scripting attacks. Exposure and defensive consequences are supported, but specific impact and remediation details are limited.

  • Potential XSS attacks through data URLs in img tags
  • Exposure of Joomla installations to cross-site scripting
  • Verification of input filtering in HTML filter code
  • Prioritization of patching for vulnerable Joomla versions

Technical summary

The vulnerability exists due to inadequate content filtering for data URLs in img tags, leading to an XSS vector. This affects Joomla versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2. Defenders should prioritize verifying and applying patches for Joomla versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2. The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 5.9 and MEDIUM severity.

Defensive priority

Defenders should prioritize verifying and applying patches for Joomla versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2.

Recommended defensive actions

  • Verify and apply patches for Joomla versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2
  • Review and update input filtering in HTML filter code
  • Monitor for potential XSS attacks

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 5.9 and MEDIUM severity. Vendor advisory is available. The vulnerability exists due to inadequate content filtering for data URLs in img tags, leading to an XSS vector. This affects Joomla versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2. Defenders should prioritize verifying and applying patches for Joomla versions 4.0.0 to 5.4.2 and 6.0.0 to 6.0.2.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-63082 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-63082

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-63082 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-63082

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://developer.joomla.org/security-centre/1016-20260101-core-inadequate-content-filtering-for-data-urls.html

    [email protected] - Vendor Advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.