CVE-2025-61635Network attack vector

Unauthenticated CAPTCHA reloads via missing rate limiting

Published Feb 2, 2026 · Updated Feb 2, 2026

Missing rate limiting in Wikimedia Foundation ConfirmEdit allows remote attackers to reload FancyCaptcha challenges without request throttling. ApiFancyCaptchaReload handles reload requests without applying the existing badcaptcha limiter, so each request proceeds instead of being rejected after the configured threshold. The endpoint is reachable only when the FancyCaptcha module is enabled; Wikimedia has not published a concrete confidentiality, integrity, or availability consequence.

CVSS severity0.0
None
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing rate limiting in Wikimedia Foundation ConfirmEdit allows remote attackers to reload FancyCaptcha challenges without request throttling. ApiFancyCaptchaReload handles reload requests without applying the existing badcaptcha limiter, so each request proceeds instead of being rejected after the configured threshold. The endpoint is reachable only when the FancyCaptcha module is enabled; Wikimedia has not published a concrete confidentiality, integrity, or availability consequence.

The record

CVE
CVE-2025-61635
Published
Feb 2, 2026
Updated
Feb 2, 2026
Vendor
Wikimedia Foundation
Product
ConfirmEdit
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 2, 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?

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  1. Affected versionversion=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · ConfirmEditversion=*

Published CVSS scores

0.0Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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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