TI-2026-67598 Aliases CVE-2026-39783 GHSA-4h7h-j3wr-4pjm

Missing authorization in WordPress Polylang exposes sensitive data

LOW 19CWE-862Published 2026-10-05 · Updated 2026-10-05

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: Low · None · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

CVE-2026-39783 (GHSA-4h7h-j3wr-4pjm) is a missing authorization flaw (CWE-862) in the WP SYNTEX Polylang plugin for WordPress that lets an attacker retrieve embedded sensitive data. Versions from n/a through 3.8.7 are affected. The CVSS 3.1 base score is 4.3 (MEDIUM), with vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N. CISA has not added it to KEV, and its SSVC exploitation rating is none.

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

Description from the CNA

Missing Authorization vulnerability in WP SYNTEX Polylang polylang allows Retrieve Embedded Sensitive Data.This issue affects Polylang: from n/a through 3.8.7.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00162 5th percentileScored 2026-11-07

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: 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
WP SYNTEX	Polylang	up to 3.8.7	—	No fix listed	CNA

Polylang VendorWP SYNTEX Affected up to 3.8.7 Fixed in — No fix listed CNA

Remediation

No fixed version is listed, so every Polylang release through 3.8.7 remains affected. Check the vendor's listing for a patched release and update to it once one is available.

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

Timeline

2026-10-05 Threatist record created from CVE-2026-39783
2026-10-05 Alias added: GHSA-4h7h-j3wr-4pjm
2026-10-05 CISA SSVC decision points changed

References

Other 1

https://patchstack.com/database/wordpress/plugin/polylang/vulnerability/wordpress-polylang-plugin-3-8-7-sensitive-data-exposure-vulnerability?_s_id=cve

TI-2026-73916 PHP object injection in WordPress Polylang plugin CVSS 3.1HIGH 7.2
TI-2026-86158 Missing authorization in WordPress Polylang plugin CVSS 3.1MEDIUM 5.4

Sources

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