How severe is CVE-2026-30948?

CVE-2026-30948 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-30948 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-30948?

CVE-2026-30948 primarily affects Parseplatform Parse-server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-30948?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-30948 have an EU (EUVD) identifier?

Yes. CVE-2026-30948 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10866.

When was CVE-2026-30948 published?

CVE-2026-30948 was published on 2026-03-10 and last updated on 2026-06-17.

CVE-2026-30948

CVE-2026-30948 is a medium-severity vulnerability in Parseplatform Parse-server with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 8.3
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10866
Weakness: CWE-79
Affected product: Parseplatform Parse-server
Published: 2026-03-10
Last modified: 2026-06-17

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.4 and 8.6.17, a stored cross-site scripting (XSS) vulnerability allows any authenticated user to upload an SVG file containing JavaScript. The file is served inline with Content-Type: image/svg+xml and without protective headers, causing the browser to execute embedded scripts in the Parse Server origin. This can be exploited to steal session tokens from localStorage and achieve account takeover. The default fileExtensions option blocks HTML file extensions but does not block SVG, which is a well-known XSS vector. All Parse Server deployments where file upload is enabled for authenticated users (the default) are affected. This vulnerability is fixed in 9.5.2-alpha.4 and 8.6.17.

Frequently asked questions

What is CVE-2026-30948?: Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.4 and 8.6.17, a stored cross-site scripting (XSS) vulnerability allows any authenticated user to upload an SVG file containing JavaScript. The file is served inline with Content-Type: image/svg+xml and without protective headers, causing the browser to execute embedded scripts in the Parse Server origin. This can be exploited to steal session tokens from localStorage and achieve account takeover. The default fileExtensions option blocks HTML file extensions but does not block SVG, which is a well-known XSS vector. All Parse Server deployments where file upload is enabled for authenticated users (the default) are affected. This vulnerability is fixed in 9.5.2-alpha.4 and 8.6.17.
How severe is CVE-2026-30948?: CVE-2026-30948 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-30948 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-30948?: CVE-2026-30948 primarily affects Parseplatform Parse-server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-30948?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-30948 have an EU (EUVD) identifier?: Yes. CVE-2026-30948 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10866.
When was CVE-2026-30948 published?: CVE-2026-30948 was published on 2026-03-10 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha2:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha3:*:*:*:node.js:*:*

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