CVE-2026-17532Public exploitNetwork attack vector

Reflected XSS via HMAC bypass and unescaped output

Published Aug 5, 2026 · Updated Aug 5, 2026

Reflected XSS in Seraphinite Accelerator 2.29.18 and earlier allows remote attackers to execute scripts via seraph_accel_prep. CacheExtractPreparePageParams loosely compares an expected HMAC with a JSON-decoded nonce, so boolean true bypasses validation, while _CbContentFinishSkip inserts selfTest into HTML without escaping. Exploitation requires a victim to follow a crafted link; successful script execution is confined to the victim's browser context.

CVSS severity6.1
Medium
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Seraphinite Accelerator 2.29.18 and earlier allows remote attackers to execute scripts via seraph_accel_prep. CacheExtractPreparePageParams loosely compares an expected HMAC with a JSON-decoded nonce, so boolean true bypasses validation, while _CbContentFinishSkip inserts selfTest into HTML without escaping. Exploitation requires a victim to follow a crafted link; successful script execution is confined to the victim's browser context.

The record

CVE
CVE-2026-17532
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Seraphinite Solutions
Product
Seraphinite Accelerator
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.29.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Seraphinite Solutions · Seraphinite Acceleratorversion=0 <=2.29.18

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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