CVE-2026-13543Public exploitNetwork attack vector

Account access via OAuth second-factor bypass

Published Jun 29, 2026 · Updated Jun 29, 2026

Improper authentication in Documenso 2.0 through 2.11.0 allows remote attackers to access accounts through Google OAuth without TOTP. The Google OAuth callback in handle-oauth-callback-url.ts calls onAuthorize and creates a full session without checking the user's twoFactorEnabled setting. Exploitation requires control of the account's matching Google identity and bypasses only Documenso's configured second factor, granting the victim's normal account access.

CVSS severity5.6
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Documenso 2.0 through 2.11.0 allows remote attackers to access accounts through Google OAuth without TOTP. The Google OAuth callback in handle-oauth-callback-url.ts calls onAuthorize and creates a full session without checking the user's twoFactorEnabled setting. Exploitation requires control of the account's matching Google identity and bypasses only Documenso's configured second factor, granting the victim's normal account access.

The record

CVE
CVE-2026-13543
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Documenso
Product
Documenso
Classifications
CWE-287, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0
  2. Affected versionversion=2.1
  3. Affected versionversion=2.10
  4. Affected versionversion=2.11.0
  5. Affected versionversion=2.2
  6. Affected versionversion=2.3
  7. Affected versionversion=2.4
  8. Affected versionversion=2.5
  9. Affected versionversion=2.6
  10. Affected versionversion=2.7
  11. Affected versionversion=2.8
  12. Affected versionversion=2.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Documenso · Documensoversion=2.0; version=2.1; version=2.10; version=2.11.0; version=2.2; version=2.3; version=2.4; version=2.5; version=2.6; version=2.7; version=2.8; version=2.9

Published CVSS scores

5.6VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
5.1VulDBAV:N/AC:H/Au:N/C:P/I:P/A:P
2.9VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

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 exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1078Valid Accounts

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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