CVE-2026-33677Public exploitNetwork attack vector

Credential disclosure via unmasked webhook BasicAuth fields

Published Mar 24, 2026 · Updated Mar 24, 2026

Sensitive information exposure in Vikunja before 2.2.1 allows remote authenticated users to read webhook BasicAuth credentials. ReadAll in pkg/models/webhooks.go clears each webhook's HMAC secret but serializes basic_auth_user and basic_auth_password without clearing them. Project read access, including team or link shares with read permission, is sufficient to obtain credentials used by external webhook receivers.

CVSS severity6.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive information exposure in Vikunja before 2.2.1 allows remote authenticated users to read webhook BasicAuth credentials. ReadAll in pkg/models/webhooks.go clears each webhook's HMAC secret but serializes basic_auth_user and basic_auth_password without clearing them. Project read access, including team or link shares with read permission, is sufficient to obtain credentials used by external webhook receivers.

The record

CVE
CVE-2026-33677
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Vikunja
Product
Vikunja
Classifications
CWE-200, T1212
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 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=< 2.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Vikunja · Vikunjaversion=< 2.2.1

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1212Exploitation for Credential Access

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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