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Response snapshot Nov 5, 2026, 01:01 UTC

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VulnerabilityCVE-2026-61687

Hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState

Hatchet version v0.86.26 and below is vulnerable to OAuth state CSRF (login CSRF / account fixation).

At a glance

Exploited
Not known
Severity
7.1 High (CVSS 3.1)
Chance of exploitation
0.2% in the next 30 days
Sources
1 source

What to do

GitHub lists first patched versions: github.com/hatchet-dev/hatchet: 0.91.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-phg3-3g28-wq9v (opens a new tab)

What happened

Summary

Hatchet version v0.86.26 and below is vulnerable to OAuth state CSRF (login CSRF / account fixation).

The vulnerable code clears the session oauth_state_ value to the empty string "" after a successful OAuth callback rather than removing the key, and the subsequent state-equality check then accepts an empty ?state= parameter on any later callback request — allowing an unauthenticated attacker to bind an already-authenticated victim's session cookie to an attacker-controlled OAuth identity (account takeover via login-CSRF).

Impact

Continue reading

Affected configurations: any deployment that has enabled at least one of auth.google.enabled, auth.github.enabled, or the Slack integration, and where the victim has completed at least one OAuth flow on that integration in the current session. Bug present on main HEAD and in every tagged release up to and including v0.86.26 (commit 243f41d9e1161e70d47dfc0a6509f1c4ddfc9c23).

Affected package ranges reported by GitHub: github.com/hatchet-dev/hatchet: < 0.91.1

Scores and how they were measured

CVSS base severity

7.1

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

0.2%

Scored Percentile 6.5%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-phg3-3g28-wq9v (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-phg3-3g28-wq9v, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  3. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-61687, scored 2026-11-04. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 4). Hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState (CVE-2026-61687). https://kevwire.com/record/CVE-2026-61687

MLA

"Hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState (CVE-2026-61687)." KEVWire, 4 Nov. 2026, kevwire.com/record/CVE-2026-61687.

Chicago

KEVWire. "Hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState (CVE-2026-61687)." Last modified November 4, 2026. https://kevwire.com/record/CVE-2026-61687.

Evidence summary (plain text)

Hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState (Sep 21, 2026).
Hatchet version v0.86.26 and below is vulnerable to OAuth state CSRF (login CSRF / account fixation).

The vulnerable code clears the session oauth_state_  value to the empty string "" after a successful OAuth callback rather than removing the key, and the subsequent state-equality check then accepts an empty ?state= parameter on any later callback request — allowing an unauthenticated attacker to bind an already-authenticated victim's session cookie to an attacker-controlled OAuth identity (account takeover via login-CSRF).
CVSS 7.1 (version 3.1; evidence as of Nov 4, 2026; https://github.com/advisories/GHSA-phg3-3g28-wq9v).
EPSS 0.2% for the following 30 days, scored Nov 4, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-61687&date=2026-11-04).
Sources:
GitHub-reviewed advisory GHSA-phg3-3g28-wq9v: https://github.com/advisories/GHSA-phg3-3g28-wq9v
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-61687&date=2026-11-04
Record ID: CVE-2026-61687.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 5, 2026, 00:26 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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