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VulnerabilityPublished Updated

CVE-2026-16957: Slim SEO (WordPress plugin) · Insecure Direct Object Reference

Affects Slim SEO (WordPress plugin)Source CVE Database V5

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Not known to be exploited · CVSS 2.7 Low : upgrade to 4.9.11 when convenient.

Data as of 8 Nov 2026, 23:24 UTC

CVSS 3.1 base score
2.7Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 22% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.9.11
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.

What to do

Upgrade Slim SEO (WordPress plugin) to 4.9.11.

Affected software

ProductAffectedFixed in
Slim SEOAffected
  • <4.9.11
Fixed in
  • 4.9.11

AI-suggested

If you cannot patch yet, restrict Contributor role permissions or limit access to the Slim SEO plugin features to trusted users only.

Description

The Slim SEO WordPress plugin before 4.9.11 does not restrict a post-meta preview feature to posts the user is allowed to edit, verifying only read access, allowing users with the Contributor role to read arbitrary post meta, including protected and private keys, of published posts they do not own, including password-protected posts and posts of non-public post types.

References

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