CVE-2025-8813Public exploitNetwork attack vector

Open redirect via unvalidated Referer header

Published Aug 10, 2025 · Updated Aug 12, 2025

Open redirect in atjiu pybbs 6.0 allows remote authenticated users to redirect users to attacker-chosen sites via a crafted Referer header. The changeLanguage handler reads the HTTP Referer header and passes it unchanged to Spring MVC's redirect view when the header is nonempty. Low privileges and passive user interaction are required, and the consequence is navigation to an untrusted site.

CVSS severityUnavailable
Unscored
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Open redirect in atjiu pybbs 6.0 allows remote authenticated users to redirect users to attacker-chosen sites via a crafted Referer header. The changeLanguage handler reads the HTTP Referer header and passes it unchanged to Spring MVC's redirect view when the header is nonempty. Low privileges and passive user interaction are required, and the consequence is navigation to an untrusted site.

The record

CVE
CVE-2025-8813
Published
Aug 10, 2025
Updated
Aug 12, 2025
Vendor
atjiu
Product
pybbs
Classifications
CWE-601, T1566.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 2025Record 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=6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

atjiu · pybbsversion=6.0

Published CVSS scores

No CVSS assessment is available in this record.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1566.002Spearphishing Link

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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