CVE-2026-55696

MEDIUMPre-NVD 4.34.3
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (28th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
4.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 4.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

PrivateBin is an online pastebin where the server has zero knowledge of pasted data. Prior to 2.0.5, AttachmentViewer.setAttachment in js/privatebin.js uses getAttachmentMimeType to accept attacker-controlled MIME types and uses getBlobUrl to create a same-origin blob before setting attachmentLink's href for the Download attachment link. The SVG-only sanitization branch updates only the preview blob, so text/html, image/svg, application/xhtml+xml, and text/xml attachments can remain active in the download blob. On an instance with fileupload = true and a weakened, stripped, or absent Content Security Policy, an anonymous attacker can create such an attachment, and a victim who opens the link in a new tab causes inline JavaScript to execute in the PrivateBin origin. The script can read origin-scoped local storage and issue same-origin requests, including requests to applications co-hosted on the same domain. This issue is fixed in version 2.0.5.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
19
EG Risk 19/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity43% × 45%
The EG Score, 4.3 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (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

August 28, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 28, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub advisoryMentions a patch (unverified)

Stored Cross-Side-Scripting (XSS) vulnerability in attachment download link via dangerous MIME types with required user-interaction · Advisory · PrivateBin/PrivateBin · GitHub

https://github.com/PrivateBin/PrivateBin/security/advisories/GHSA-f2xf-7x3g-4272
GitHub release Patch Available

Release v2.0.5 - Fix rendering unsafe attachments & base path in JSON API responses

Patch available: PrivateBin/PrivateBin 2.0.5

https://github.com/PrivateBin/PrivateBin/releases/tag/2.0.5
GitHub commit Patch Available

commit 7f1f40853efe (PrivateBin/PrivateBin)

Patch available: PrivateBin/PrivateBin 2.0.5 (contains commit 7f1f40853efe)

https://github.com/PrivateBin/PrivateBin/commit/7f1f40853efe0eb12db9cc4a30ea8524ac00f423

Vendor Advisories for CVE-2026-55696(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
privatebin/privatebin1.0 ... 2.0.4 (35 versions)
  • every version up to 2.0.5: fixed in 2.0.5
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 53× 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  9. 2026-10-10 03:48 UTCEG score recompute
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  11. 2026-10-09 02:37 UTCEG score recompute
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  13. 2026-10-08 00:48 UTCEG score recompute
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  15. 2026-10-06 17:50 UTCEG score recompute
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-10-05 16:49 UTCEG score recompute
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  20. 2026-10-04 14:39 UTCEG score recompute
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-10-03 13:38 UTCEG score recompute
  23. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  24. 2026-10-02 06:27 UTCEG score recompute
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 28th percentile
Show 56 more
  1. 2026-10-01 05:26 UTCEG score recompute
  2. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-09-30 03:49 UTCEG score recompute
  4. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  5. 2026-09-28 21:07 UTCEG score recompute
  6. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  7. 2026-09-27 16:37 UTCEG score recompute
  8. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  9. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  10. 2026-09-26 15:33 UTCEG score recompute
  11. 2026-09-25 13:35 UTCEG score recompute
  12. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  13. 2026-09-24 12:20 UTCEG score recompute
  14. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  15. 2026-09-23 11:18 UTCEG score recompute
  16. 2026-09-22 10:16 UTCEG score recompute
  17. 2026-09-21 09:15 UTCEG score recompute
  18. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  19. 2026-09-20 08:14 UTCEG score recompute
  20. 2026-09-19 06:31 UTCEG score recompute
  21. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  22. 2026-09-18 05:28 UTCEG score recompute
  23. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  24. 2026-09-17 04:26 UTCEG score recompute
  25. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  26. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  27. 2026-09-16 03:25 UTCEG score recompute
  28. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  29. 2026-09-14 01:22 UTCEG score recompute
  30. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  31. 2026-09-13 00:21 UTCEG score recompute
  32. 2026-09-11 23:19 UTCEG score recompute
  33. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  34. 2026-09-10 22:13 UTCEG score recompute
  35. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  36. 2026-09-09 03:56 UTCEG score recompute
  37. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  38. 2026-09-08 02:55 UTCEG score recompute
  39. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  40. 2026-09-07 01:53 UTCEG score recompute
  41. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  42. 2026-09-06 00:48 UTCEG score recompute
  43. 2026-09-04 23:45 UTCEG score recompute
  44. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  45. 2026-09-02 21:38 UTCEG score recompute
  46. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  47. 2026-09-01 20:32 UTCEG score recompute
  48. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  49. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  50. 2026-08-31 19:30 UTCEG score recompute
  51. 2026-08-31 18:56 UTCEG score recompute
  52. 2026-08-31 00:46 UTCEG score recompute
  53. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  54. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  55. 2026-08-28 22:43 UTCEG score recompute
  56. 2026-08-28 21:11 UTCEG score recomputeFirst assessed: 4.3 MEDIUM

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Frequently asked(5)

What is CVE-2026-55696?
CVE-2026-55696 is a medium-severity vulnerability; its CVE record was published on August 28, 2026. PrivateBin is an online pastebin where the server has zero knowledge of pasted data. Prior to 2.0.5, AttachmentViewer.setAttachment in js/privatebin.js uses getAttachmentMimeType to accept attacker-controlled MIME types and uses getBlobUrl to create a same-origin blob before setting…
When was the CVE record for CVE-2026-55696 published?
The CVE record for CVE-2026-55696 was published on August 28, 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 September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-55696 actively exploited?
CVE-2026-55696 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55696?
CVE-2026-55696 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55696?
A fix for CVE-2026-55696 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55696 are linked in the Vendor Advisories panel on this page.

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