REDAXO is a PHP-based content management system. Prior to 5.21.2, the mediaIsInUse() handler in redaxo/src/addons/media_manager/lib/media_manager.php inserts a Media Manager type name into raw backend warning HTML without escaping it when invoked through MEDIA_IS_IN_USE. An administrator with Media Manager access can store HTML in a type name, and the payload executes in another administrator's browser when that administrator tries to delete media referenced by the type's effects, enabling session theft or unauthorized backend actions. This issue is fixed in version 5.21.2.
CVE-2026-63001
MEDIUMPre-NVD 4.84.8
EchelonGraph scoreLOW confidence
This medium-severity CVE scores 4.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 4.8Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.8
- EG Score
- 4.8(low)
- EG Risk
- 22(Track)EG Risk 22/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity48% × 45%Exploitation0% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
September 23, 2026
Last Modified
September 23, 2026
Advisory Details (4)
Auto-updated Sep 23, 2026🔬 Proof of concept available. Patch available. Sources: github_pr, github_commit, github_release, github.
github_release Patch Available
Version 5.21.2
Patch available: redaxo/core 5.21.2
https://github.com/redaxo/core/releases/tag/5.21.2github_commit Patch Available
commit 2daaa3a30570 (redaxo/core)
Patch available: redaxo/core 5.21.2 (contains commit 2daaa3a30570)
https://github.com/redaxo/core/commit/2daaa3a30570bc76a82f63fd21fb8c9c2cd5dc7cgithub_pr Patch Available
fix: escape user-controlled values rendered as raw backend HTML (stored XSS)
Patch available: redaxo/core 5.21.2 (PR #6581 merged 2026-06-29)
https://github.com/redaxo/core/pull/6581github Patch Available🟡 PoC Available
Stored XSS via Unescaped Media Manager Type Name in `mediaIsInUse()` · Advisory · redaxo/core · GitHub
https://github.com/redaxo/core/security/advisories/GHSA-mf2p-wjp4-99pqVendor Advisories for CVE-2026-63001(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 5× in last 7d / 5× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-23 20:23 UTCEG score recompute
- 2026-09-23 19:53 UTCEG score recompute
- 2026-09-23 15:18 UTCEG score recompute
- 2026-09-23 14:24 UTCEG score recompute
- 2026-09-23 14:24 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(4)
What is CVE-2026-63001?
CVE-2026-63001 is a medium vulnerability published on September 23, 2026. REDAXO is a PHP-based content management system. Prior to 5.21.2, the mediaIsInUse() handler in redaxo/src/addons/mediamanager/lib/mediamanager.php inserts a Media Manager type name into raw backend warning HTML without escaping it when invoked through MEDIAISIN_USE. An administrator with Media…
When was CVE-2026-63001 disclosed?
CVE-2026-63001 was first published in the National Vulnerability Database on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-63001?
CVE-2026-63001 has a CVSS v3 base score of 4.8 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-63001?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63001, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-63001
Is Your Infrastructure Affected by CVE-2026-63001?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.