TI-2026-81111 Aliases CVE-2026-117535 GHSA-pmxw-f2gq-hx4c

Reflected XSS via opener_link in REDAXO Media Pool

LOW 23CWE-79Published 2026-10-27 · Updated 2026-11-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: Active
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 5.21.3 contains a reflected cross-site scripting flaw in the backend media pool detail page, where the opener_link parameter is output without HTML escaping (CWE-79). An unauthenticated remote attacker can lure a logged-in backend user with media permissions into clicking a crafted link. The injected script can read the CSRF token and perform actions with the victim's permissions, including code execution through template or module edits when the victim is an administrator.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

REDAXO before 5.21.3 contains a reflected cross-site scripting vulnerability in the backend media pool detail page, where the opener_link parameter is rendered without HTML escaping. Unauthenticated attackers can lure logged-in backend users with media permissions into clicking a crafted link. The injected script can then read the CSRF token and perform actions with the victim's permissions, including code execution via template or module edits when the victim is an administrator.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00199 9th percentileScored 2026-11-07

Fix Fixed core (redaxo): 5.21.3

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

Vendor	Product	Affected versions	Fixed in	Status	Source
redaxo	core	before 5.21.3	5.21.3	Patch available	CNA

core Vendorredaxo Affected before 5.21.3 Fixed in 5.21.3 Patch available CNA

CPE names Threatist (inferred) · 1

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

CPE	Versions	Role	Vendor
cpe:2.3:a:redaxo:redaxo::::::::	—	—	redaxo

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

Remediation

Update REDAXO core to version 5.21.3, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Fix · CNA core (redaxo) Fixed in 5.21.3

Fixed in the same release

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

Release · 2026-10-27
redaxo core 5.21.3
3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2026-81112 REDAXO CSRF Token Bypass in users/users Enables Privilege EscalationPriority MEDIUM 44
- TI-2026-81110 Cross-site request forgery in REDAXO article history pluginPriority LOW 22
Show all 3 records →

Timeline

2026-10-27 Threatist record created from CVE-2026-117535
2026-10-27 Alias added: GHSA-pmxw-f2gq-hx4c
2026-11-02 CISA SSVC decision points changed

References

Advisory 1

GitHub Security Advisory (GHSA-5293-gg47-5xmh)

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