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GHSA-q342-9w2p-57fp

MediumCVSS 6.9 / 10

Published Mar 10, 2026·Last modified Mar 16, 2026

Affected Components(0)

No affected components available

Description

Impact

The requestKeywordDenylist security control can be bypassed by placing any nested object or array before a prohibited keyword in the request payload. This is caused by a logic bug that stops scanning sibling keys after encountering the first nested value. Any custom requestKeywordDenylist entries configured by the developer are equally by-passable using the same technique.

All Parse Server deployments are affected. The requestKeywordDenylist is enabled by default.

Patches

The fix replaces the recursive object scanner with an iterative stack-based traversal that processes all nested values without prematurely exiting the scan loop. This also eliminates a potential stack overflow on deeply nested payloads.

Workarounds

Use a Cloud Code beforeSave trigger to validate incoming data for prohibited keywords across all classes.

References

GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-q342-9w2p-57fp
Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.1-alpha.1
Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.12

Risk Scores

Base Score

6.9

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence

2.7

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

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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Medium severity

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