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TI-2026-70473 Aliases CVE-2026-88903GHSA-vrpv-vc9c-j35f

Stored XSS in Topcontent WordPress plugin via content webhook

Priority MEDIUM 40CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

The Topcontent WordPress plugin through 1.2.1 does not properly authorise one of its request handlers and disables HTML sanitisation before storing submitted content, which leads to cross-site scripting (CWE-79). An unauthenticated remote attacker can publish posts containing malicious JavaScript on sites where the plugin's API key was never configured. The references include an exploit link.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

The Topcontent WordPress plugin through 1.2.1 does not properly authorise one of its request handlers and disables HTML sanitisation before storing the submitted content, allowing unauthenticated attackers to publish arbitrary posts containing malicious JavaScript on any site where its API key has never been configured.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00276 20th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownTopcontentup to 1.2.1—No fix listedCNA
  • Topcontent VendorUnknown Affected up to 1.2.1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Topcontent.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-11 Threatist record created from CVE-2026-88903
  2. 2026-10-11 Alias added: GHSA-vrpv-vc9c-j35f
  3. 2026-10-12 Priority changed: LOW → MEDIUM

References

Exploit 1

Sources

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