CVE-2026-33436

MEDIUMNVD 6.16.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.2% (6th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-23513 (ENISA EUVD)Source: ENISA EUVD

6.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.1Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

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.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity61% × 45%
Impact severity (EG Severity): CVSS 6.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.1): severity, escalated by confirmed exploitation. This CVE's 6.1 is its impact severity (EG Severity), not escalated.

EG Severity
6.1 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-26). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 17, 2026

Last Modified

October 26, 2026

Advisory Details (1)

Auto-updated Oct 26, 2026
🔬 Proof of concept available. Fix named in the CVE record. Sources: github.
GitHub advisoryMentions a patch (unverified)🟡 PoC Available

Reflected XSS through crafted filename in file upload functionality · Advisory · Stirling-Tools/Stirling-PDF · GitHub

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

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 37× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 96 of 199 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 103 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  2. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  3. 2026-10-26 21:29 UTCEG score recompute▲ 3.00
  4. 2026-10-26 21:26 UTCNVD updateCVSS v3 → 6.1 · severity → MEDIUM
  5. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  6. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  7. 2026-10-25 14:34 UTCEG score recompute
  8. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  9. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  10. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  15. 2026-10-18 03:46 UTCEG score recompute
  16. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  18. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  20. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  21. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  22. 2026-10-12 16:13 UTCEG score recompute
  23. 2026-10-11 19:55 UTCEG score recompute
  24. 2026-10-11 17:09 UTCEG score recompute
  25. 2026-10-11 14:36 UTCEG score recompute
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  1. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  2. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  3. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  4. 2026-10-09 02:28 UTCOSV refresh
  5. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  6. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  7. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  8. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  9. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  10. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  13. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  14. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  15. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  16. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  17. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  18. 2026-09-19 09:30 UTCOSV refresh
  19. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  20. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  22. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 6th percentile
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  24. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  25. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  26. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  27. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  28. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  29. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  30. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  31. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
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  34. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  35. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  36. 2026-08-31 13:04 UTCOSV refresh
  37. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  38. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  39. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  40. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  41. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  42. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  43. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  44. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  45. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  46. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  47. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  48. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  49. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  50. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  51. 2026-08-14 18:07 UTCEG score recompute
  52. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  53. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  54. 2026-08-11 22:27 UTCEG score recompute
  55. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  56. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  57. 2026-08-09 03:53 UTCEG score recompute
  58. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  59. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  60. 2026-08-05 23:18 UTCEG score recompute
  61. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  62. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  63. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  64. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  65. 2026-08-02 13:02 UTCEG score recompute
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  70. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  71. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.2% · 6th percentile

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Frequently asked(5)

What is CVE-2026-33436?
CVE-2026-33436 is a medium-severity vulnerability; its CVE record was published on April 17, 2026. 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…
When was the CVE record for CVE-2026-33436 published?
The CVE record for CVE-2026-33436 was published on April 17, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-33436 actively exploited?
CVE-2026-33436 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33436?
CVE-2026-33436 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-33436?
The CVE record for CVE-2026-33436 names the fix: "The issue has been fixed in version 2.0.0."

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