How severe is CVE-2026-33436?

CVE-2026-33436 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-33436 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33436?

CVE-2026-33436 affects Stirlingpdf Stirling Pdf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33436?

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

Does CVE-2026-33436 have an EU (EUVD) identifier?

Yes. CVE-2026-33436 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23513.

When was CVE-2026-33436 published?

CVE-2026-33436 was published on 2026-04-17 and last updated on 2026-06-17.

CVE-2026-33436

CVE-2026-33436 is a low-severity vulnerability in Stirlingpdf Stirling Pdf with a CVSS 3.x base score of 3.1. 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: Low (CVSS 3.x base score 3.1)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23513
Weakness: CWE-79
Affected product: Stirlingpdf Stirling Pdf
Published: 2026-04-17
Last modified: 2026-06-17

Description

Stirling-PDF is a locally hosted web application that facilitates various operations on PDF files. In versions prior to 2.0.0, file upload endpoints render user-supplied filenames directly into HTML using unsafe methods like innerHTML without sanitization. An attacker can craft a file with a malicious filename containing JavaScript that executes in the uploading user's browser context, resulting in reflected XSS. The issue affects numerous upload endpoints across the application. The issue has been fixed in version 2.0.0.

Frequently asked questions

What is CVE-2026-33436?: Stirling-PDF is a locally hosted web application that facilitates various operations on PDF files. In versions prior to 2.0.0, file upload endpoints render user-supplied filenames directly into HTML using unsafe methods like innerHTML without sanitization. An attacker can craft a file with a malicious filename containing JavaScript that executes in the uploading user's browser context, resulting in reflected XSS. The issue affects numerous upload endpoints across the application. The issue has been fixed in version 2.0.0.
How severe is CVE-2026-33436?: CVE-2026-33436 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-33436 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33436?: CVE-2026-33436 affects Stirlingpdf Stirling Pdf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33436?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33436 have an EU (EUVD) identifier?: Yes. CVE-2026-33436 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23513.
When was CVE-2026-33436 published?: CVE-2026-33436 was published on 2026-04-17 and last updated on 2026-06-17.

References

https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-q5j3-4m5w-wp75

Affected products (1)

cpe:2.3:a:stirlingpdf:stirling_pdf:*:*:*:*:*:*:*:*

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