PHP object injection in WordPress Polylang plugin
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.
Summary
WP SYNTEX Polylang from n/a through 3.8.9 deserializes untrusted data, which allows PHP object injection (CWE-502). A remote attacker with high privileges can exploit it without user interaction to affect confidentiality, integrity and availability.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
Deserialization of Untrusted Data vulnerability in WP SYNTEX Polylang polylang allows Object Injection.This issue affects Polylang: from n/a through 3.8.9.
Why it matters now
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
Remediation
The sources list no fixed version for Polylang.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Timeline
- 2026-10-14 Threatist record created from CVE-2026-97278
- 2026-10-14 CISA SSVC decision points changed
- 2026-10-14 Priority changed: MEDIUM → LOW
- 2026-10-14 Alias added: GHSA-qr9f-p3hp-mggj
References
More WP SYNTEX vulnerabilities
- TI-2026-86158 Missing authorization in WordPress Polylang plugin CVSS 3.1MEDIUM 5.4
- TI-2026-67598 Missing authorization in WordPress Polylang exposes sensitive data CVSS 3.1MEDIUM 4.3
Sources
- CVE-2026-97278 · CVE Program
- CVE-2026-97278 · NVD
- FIRST EPSS
- GHSA-qr9f-p3hp-mggj · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences