CVE-2024-34535Network attack vector

Password takeover via unrate-limited change endpoint

Published Oct 3, 2024 · Updated Nov 25, 2024

Rate-limit bypass in Mastodon 4.1.16 and earlier and 4.2.0 through 4.2.8 allows remote authenticated users to guess weak passwords. The password change endpoint performs no rate-limit check before accepting repeated current-password guesses. Exploitation requires the victim's valid session cookie and a weak current password; successful guessing exposes that password and permits its replacement.

CVSS severity5.9
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Rate-limit bypass in Mastodon 4.1.16 and earlier and 4.2.0 through 4.2.8 allows remote authenticated users to guess weak passwords. The password change endpoint performs no rate-limit check before accepting repeated current-password guesses. Exploitation requires the victim's valid session cookie and a weak current password; successful guessing exposes that password and permits its replacement.

The record

CVE
CVE-2024-34535
Published
Oct 3, 2024
Updated
Nov 25, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-444, T1110
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 25, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.9CISA-ADPCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1110Brute Force

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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