Vulnerability-Lookup

CVE-2026-17532 (GCVE-0-2026-17532)

Vulnerability from cvelistv5 – Published: 2026-08-05 06:37 – Updated: 2026-08-05 14:15

Title

Seraphinite Accelerator <= 2.29.18 - Reflected Cross-Site Scripting

Summary

The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'seraph_accel_prep' parameter in versions up to, and including, 2.29.15. This is due to the CacheExtractPreparePageParams() function using PHP's loose inequality operator (!=) to compare the expected HMAC string against the JSON-decoded 'nonce' value — supplying the JSON boolean true causes any non-empty HMAC string to compare as loosely equal, bypassing the signature check — combined with insufficient output escaping in the _CbContentFinishSkip() function, which concatenates the attacker-controlled 'selfTest' field directly into the HTML response body. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.

Severity

6.1 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

Wordfence

References

9 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://plugins.trac.wordpress.org/browser/seraph…
https://plugins.trac.wordpress.org/browser/seraph…
https://plugins.trac.wordpress.org/browser/seraph…
https://plugins.trac.wordpress.org/browser/seraph…
https://plugins.trac.wordpress.org/browser/seraph…
https://plugins.trac.wordpress.org/browser/seraph…
https://plugins.trac.wordpress.org/changeset?sfp_…
https://plugins.trac.wordpress.org/changeset?sfp_…

Impacted products

1 product

Vendor	Product	Version
seraphinitesoft	Seraphinite Accelerator	Affected: 0 , ≤ 2.29.18 (semver)

Credits

Alireza

Show details on NVD website

JSON

To clipboard

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}

GHSA-FF83-HFR5-72CH

Vulnerability from github – Published: 2026-08-05 09:31 – Updated: 2026-08-05 09:31

Details

Severity

6.1 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

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  "affected": [],
  "aliases": [
    "CVE-2026-17532"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-05T08:16:32Z",
    "severity": "MODERATE"
  },
  "details": "The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the \u0027seraph_accel_prep\u0027 parameter in versions up to, and including, 2.29.15. This is due to the CacheExtractPreparePageParams() function using PHP\u0027s loose inequality operator (!=) to compare the expected HMAC string against the JSON-decoded \u0027nonce\u0027 value \u2014 supplying the JSON boolean true causes any non-empty HMAC string to compare as loosely equal, bypassing the signature check \u2014 combined with insufficient output escaping in the _CbContentFinishSkip() function, which concatenates the attacker-controlled \u0027selfTest\u0027 field directly into the HTML response body. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.",
  "id": "GHSA-ff83-hfr5-72ch",
  "modified": "2026-08-05T09:31:16Z",
  "published": "2026-08-05T09:31:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-17532"
    },
    {
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      "url": "https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/cache.php#L76"
    },
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    },
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    },
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    },
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    },
    {
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      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-17532 (GCVE-0-2026-17532)

GHSA-FF83-HFR5-72CH

Tags

Sightings

Nomenclature