CVE-2025-41376Network attack vector

HTTP response splitting via token path CRLF

Published Aug 1, 2025 · Updated Sep 11, 2025

CRLF injection in LimeSurvey before 3.0.0 allows remote attackers to inject HTTP headers through a crafted survey token URL. The survey index endpoint accepts encoded CRLF bytes in the token path segment and treats following bytes as a new response header. No authentication is required, but a victim must act on the crafted response; the injected header can alter downstream browser handling.

CVSS severity5.1
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CRLF injection in LimeSurvey before 3.0.0 allows remote attackers to inject HTTP headers through a crafted survey token URL. The survey index endpoint accepts encoded CRLF bytes in the token path segment and treats following bytes as a new response header. No authentication is required, but a victim must act on the crafted response; the injected header can alter downstream browser handling.

The record

CVE
CVE-2025-41376
Published
Aug 1, 2025
Updated
Sep 11, 2025
Vendor
LimeSurvey GmbH
Product
LimeSurvey
Classifications
CWE-93, CAPEC-15
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LimeSurvey GmbH · LimeSurveyversion=3.0

Published CVSS scores

5.3INCIBECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.1INCIBECVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
CAPEC-15Command Delimiters

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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