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GHSA-79wj-8rqv-jvp5

HighCVSS 8.5 / 10

Published Mar 6, 2026·Last modified Mar 16, 2026

Affected Components(0)

No affected components available

Description

Impact

The readOnlyMasterKey can call POST /loginAs to obtain a valid session token for any user. This allows a read-only credential to impersonate arbitrary users with full read and write access to their data. Any Parse Server deployment that uses readOnlyMasterKey is affected.

Patches

The fix adds a check to the /logInAs handler.

Workarounds

There is no workaround other than not using readOnlyMasterKey.

References

GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5
Fix for Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4
Fix for Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.6

Risk Scores

Base Score

8.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence

6.0

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS

0.39%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity

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