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VulnerabilityPublished

CVE-2025-15678: Nexter Blocks (WordPress plugin) · Cross-Site Scripting (XSS)

Affects Nexter Blocks (WordPress plugin)Source CVE Database V5

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Not known to be exploited · CVSS 6.1 Medium : upgrade to 5.0.2 when convenient.

Data as of 5 Nov 2026, 23:23 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 16% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 5.0.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 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 5 Nov 2026.

What to do

Upgrade Nexter Blocks (WordPress plugin) to 5.0.2.

Affected software

ProductAffectedFixed in
Nexter BlocksAffected
  • <5.0.2
Fixed in
  • 5.0.2

AI-suggested

Since the vulnerability involves improper sanitization of SVG uploads, restricting SVG uploads to trusted users or disabling SVG uploads until a fix is available may reduce risk. Monitor official Nexter Blocks plugin updates for a security patch addressing this issue.

Description

Nexter Blocks WordPress plugin versions before 5.0.2 allow users with file upload permissions (such as Authors) to upload SVG files containing malicious JavaScript. These files are not properly sanitized, leading to stored Cross-Site Scripting (XSS) vulnerabilities that execute when the SVG file is accessed.

References

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