CVE-2026-55891

UNRATEDCVSS · not yet scoredTrending — 4 sources updated this weekElevated

Also known asEUVD-2026-67940 (ENISA EUVD) · GHSA-xrjc-c68j-hp7w (GitHub Security Advisories)Source: ENISA EUVD

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EchelonGraph verdictPlan a fixWithin your standard update timelines — no confirmed exploitation yet.
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS v2: —Exploit: No code on recordExposed 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, Request::getRequestUri() in lib/Request.php passes $_SERVER['REQUEST_URI'] through FILTER_SANITIZE_URL, which does not remove quotation marks, angle brackets, or apostrophes, and Controller::_init() stores the attacker-controlled value in Controller::$_urlBase. Controller::_jsonld() in lib/Controller.php then uses str_replace() to insert that value without JSON escaping into js/types.jsonld, js/paste.jsonld, and the other JSON-LD templates used by /?jsonld= and /?pasteid. A raw quotation mark delivered by an HTTP client, proxy, or structured-data crawler that does not normalize the request target can break out of the JSON string and inject arbitrary key-value data into a CORS-open application/ld+json response. The jsonld branch in Controller::__construct() returns before _setCacheHeaders(), so the response also lacks X-Content-Type-Options: nosniff, Content Security Policy, X-Frame-Options, and Referrer-Policy. Direct script execution was not demonstrated, but manipulated responses can affect structured-data consumers or combine with less strict clients. This issue is fixed in version 2.0.5.

CVSS v3
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EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
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EPSS PROB
0.5%
EPSS %ILE
45th
KEV
Not listed

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

EG Severity
Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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
No SSVC decision: EchelonGraph has not assessed this CVECISA 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, and whom BOD 26-04 binds: the BOD 26-04 block below.

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.

The score's inputs: 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

References (3)

Vendor Advisories for CVE-2026-55891(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
composerprivatebin/privatebin @ 2.0.5 (fixes <= 2.0.4)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

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
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Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 40× 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. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  3. 2026-11-01 07:43 UTCGHSA enrichmentGHSA-xrjc-c68j-hp7w · GitHub severity LOW
  4. 2026-11-01 07:43 UTCEG score recompute
  5. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  6. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  7. 2026-10-29 17:48 UTCEG score recompute
  8. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  9. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  10. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  11. 2026-10-27 06:55 UTCOSV refresh
  12. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  13. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  14. 2026-10-25 14:18 UTCEG score recompute
  15. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  16. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  17. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  18. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  19. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  20. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  21. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  22. 2026-10-18 03:29 UTCEG score recompute
  23. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  24. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  25. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
Show 49 more
  1. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  4. 2026-10-12 15:55 UTCEG score recompute
  5. 2026-10-11 19:38 UTCEG score recompute
  6. 2026-10-11 16:53 UTCEG score recompute
  7. 2026-10-11 14:16 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-01 01:21 UTCEG score recompute
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  26. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  27. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  28. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  29. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  30. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  31. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  32. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  33. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  34. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  35. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  36. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  37. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  38. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  39. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  40. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  41. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  42. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  43. 2026-08-31 19:20 UTCNVD update
  44. 2026-08-31 18:56 UTCEG score recompute
  45. 2026-08-31 18:49 UTCMITRE cvelistV5
  46. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  47. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  48. 2026-08-28 22:34 UTCNVD update
  49. 2026-08-28 21:11 UTCEG score recompute

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Frequently asked(4)

What is CVE-2026-55891?
CVE-2026-55891 is a vulnerability whose severity is not yet rated; 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, Request::getRequestUri() in lib/Request.php passes $_SERVER['REQUEST_URI'] through FILTER_SANITIZE_URL, which does not remove quotation marks, angle brackets, or apostrophes, and Controller::_init()…
When was the CVE record for CVE-2026-55891 published?
The CVE record for CVE-2026-55891 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-2026-55891 actively exploited?
CVE-2026-55891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-55891?
A fix for CVE-2026-55891 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55891 are linked in the Vendor Advisories panel on this page.

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