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TI-2026-81107 Aliases CVE-2026-116900GHSA-34c3-hq82-r6qj

Stored XSS in REDAXO media and link input widgets

Priority LOW 22CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

REDAXO before 5.21.4 contains a stored cross-site scripting flaw (CWE-79) in its media, medialist, link and linklist input widgets. Content editors can store unescaped values that break out of the value attribute and run script in administrators' backend sessions. An attacker with low privileges who can submit crafted REX_INPUT_MEDIA or REX_INPUT_LINK values can hijack administrator accounts, and user interaction is required.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Description from the CNA

REDAXO before 5.21.4 contains a stored cross-site scripting vulnerability that allows content editors to inject HTML by storing unescaped values rendered by media, medialist, link and linklist widgets. Attackers can submit crafted REX_INPUT_MEDIA or REX_INPUT_LINK values that break out of the value attribute, executing script in administrators' backend sessions to hijack accounts.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00138 3rd percentileScored 2026-11-07
Fix Fixed core (redaxo): 5.21.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
redaxocorebefore 5.21.45.21.4Patch availableCNA
  • core Vendorredaxo Affected before 5.21.4 Fixed in 5.21.4 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:*——redaxo
  • cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:* Versions — — ·redaxo

Remediation

Upgrade REDAXO core to version 5.21.4 or later, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

  • Fix · CNA core (redaxo) Fixed in 5.21.4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    redaxo core 5.21.4

    6 records Highest priority Priority MEDIUM 1 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2026-81108 Authentication bypass in REDAXO Core history plugin allows token forgeryPriority MEDIUM 49
    • TI-2026-81104 Missing authorization in REDAXO version and history previewsPriority LOW 31
    • TI-2026-81106 REDAXO slice operations allow editors to modify others' slicesPriority LOW 30
    Show all 6 records →

Timeline

  1. 2026-10-27 Threatist record created from CVE-2026-116900
  2. 2026-10-27 Alias added: GHSA-34c3-hq82-r6qj
  3. 2026-10-31 CISA SSVC decision points changed

References

Advisory 1

  • TI-2018-15578 Redaxo CMS Mediapool Addon 5.5.1 Arbitrary File Upload CVSS 4.0HIGH 8.7
  • TI-2026-17559 Redaxo has Path Traversal in Backup Addon Leading to Arbitrary File Read CVSS 4.0HIGH 8.3
  • TI-2026-38656 Unrestricted file upload in redaxo core CVSS 3.1HIGH 7.5
  • TI-2025-39517 A Remote Code Execution (RCE) vulnerability in the template management component in… CVSS 3.1HIGH 7.2
  • TI-2024-30898 REDAXO CMS v2.11.0 was discovered to contain a remote code execution (RCE) vulnerability. CVSS 3.1HIGH 7.2
  • TI-2024-30896 An arbitrary file upload vulnerability in the MediaPool module of Redaxo CMS v5.17.1… CVSS 3.1HIGH 7.2
See all 48 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences