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CVE-2026-34532

33
FAUCET Score

CVE-2026-34532 details a critical access control bypass vulnerability affecting Parse Server versions prior to 8.6.67 and 9.7.0-alpha.11. This flaw allows unauthenticated attackers to invoke protected Cloud Functions by appending "prototype.constructor" to the function name in the URL, thereby bypassing validator access controls. Rated 9.1 CRITICAL on the CVSS scale, it presents a low-complexity network attack vector with high potential impact on confidentiality and integrity. Currently, there is no evidence of active exploitation or public exploit code available, though the vulnerability has received limited community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.6.67CPE matchmatch criteria
cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*
>= 9.0.0, < 9.7.0CPE matchmatch criteria
cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*
9.7.0CPE matchmatch criteria
cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha1:*:*:*:node.js:*:*
9.7.0CPE matchmatch criteria
cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha10:*:*:*:node.js:*:*
9.7.0CPE matchmatch criteria
cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha2:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 4.0

9.1CRITICAL

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.28%
Probability of exploitation in next 30 days
EPSS Percentile
19.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0028 is in the 2nd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: parse-serverFixed in: 9.7.0-alpha.11
npmpatch availablevia ghsa
Product: parse-serverFixed in: 8.6.67

Vendor Advisories (1)

npmGHSA-vpj2-qq7w-5qq6critical

parse-server has cloud function validator bypass via prototype chain traversal

Mar 31, 2026

References

github.com / parse-community/parse-server/commit/4fc48cf28f22eea200d74d883505f485234a48d7
Patch
github.com / parse-community/parse-server/commit/dc59e272665644083c5b7f6862d88ce1ef0b2674
Patch
github.com / parse-community/parse-server/pull/10342
Issue TrackingPatch
github.com / parse-community/parse-server/pull/10343
Issue TrackingPatch
github.com / parse-community/parse-server/security/advisories/GHSA-vpj2-qq7w-5qq6
MitigationPatchVendor Advisory