CVE-2026-55834

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% (29th 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
Elevated
4.3EG
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: 0.4%CVSS: 4.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to services. From 2.6.0 until 2.9.0, frontend/src/routes/authorize/+page.ts reads the redirect_uri query parameter and frontend/src/routes/authorize/+page.svelte uses the raw callbackURL in redirectWithError when prompt=none cannot complete silent authorization. The client-side path only blocks javascript and data schemes and does not invoke the backend callback allow-list validation, so an unauthenticated attacker who knows a valid client_id can redirect a victim browser to an arbitrary HTTP or HTTPS origin for phishing or OIDC error and state smuggling. This issue is fixed in version 2.9.0.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100

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.
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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

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

A fix is available. 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

August 28, 2026

Last Modified

September 9, 2026

Advisory Details (3)

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

Open Redirect on the OIDC /authorize page via unvalidated redirect_uri with prompt=none · Advisory · pocket-id/pocket-id · GitHub

https://github.com/pocket-id/pocket-id/security/advisories/GHSA-2wvm-8mvp-22qv
GitHub release Patch Available

v2.9.0

Patch available: pocket-id/pocket-id v2.9.0

https://github.com/pocket-id/pocket-id/releases/tag/v2.9.0
GitHub commit

commit 8a7577497131 (pocket-id/pocket-id)

Fix landed in pocket-id/pocket-id commit 8a7577497131 — awaiting tagged release

https://github.com/pocket-id/pocket-id/commit/8a7577497131229badb35cb4b3a4227b1300afff

Vendor Advisories for CVE-2026-55834(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)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/pocket-id/pocket-id/backend—
  • 2.6.0 up to 2.9.0: fixed in 2.9.0
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× 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% · 29th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 29th 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% · 29th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  9. 2026-10-10 05:16 UTCEG score recompute
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  11. 2026-10-09 02:39 UTCEG score recompute
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  14. 2026-10-07 09:25 UTCEG score recompute
  15. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  16. 2026-10-06 07:28 UTCEG score recompute
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-10-05 04:30 UTCEG score recompute
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  20. 2026-10-04 02:14 UTCEG score recompute
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-10-03 00:28 UTCEG score recompute
  23. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  24. 2026-10-01 21:36 UTCEG score recompute
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 28th percentile
Show 56 more
  1. 2026-09-30 19:49 UTCEG score recompute
  2. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  4. 2026-09-29 14:11 UTCEG score recompute
  5. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  6. 2026-09-28 11:38 UTCEG score recompute
  7. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  8. 2026-09-27 09:50 UTCEG score recompute
  9. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  10. 2026-09-26 08:04 UTCEG score recompute
  11. 2026-09-24 23:25 UTCEG score recompute
  12. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  13. 2026-09-23 21:35 UTCEG score recompute
  14. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-09-22 19:50 UTCEG score recompute
  16. 2026-09-21 18:04 UTCEG score recompute
  17. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-09-20 16:18 UTCEG score recompute
  19. 2026-09-19 14:32 UTCEG score recompute
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-09-18 12:43 UTCEG score recompute
  22. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  23. 2026-09-17 10:57 UTCEG score recompute
  24. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  25. 2026-09-16 09:11 UTCEG score recompute
  26. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  27. 2026-09-15 06:04 UTCEG score recompute
  28. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  29. 2026-09-14 04:15 UTCEG score recompute
  30. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  31. 2026-09-13 02:30 UTCEG score recompute
  32. 2026-09-12 00:43 UTCEG score recompute
  33. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  34. 2026-09-10 22:57 UTCEG score recompute
  35. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  36. 2026-09-09 00:27 UTCEG score recompute
  37. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  38. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  39. 2026-09-07 15:02 UTCEG score recompute
  40. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  41. 2026-09-06 13:03 UTCEG score recompute
  42. 2026-09-05 11:18 UTCEG score recompute
  43. 2026-09-04 09:31 UTCEG score recompute
  44. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  45. 2026-09-03 07:45 UTCEG score recompute
  46. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  47. 2026-09-02 05:56 UTCEG score recompute
  48. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  49. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  50. 2026-08-31 02:20 UTCEG score recompute
  51. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  52. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  53. 2026-08-28 22:48 UTCEG score recompute
  54. 2026-08-28 22:09 UTCEG score recompute
  55. 2026-08-28 20:25 UTCEG score recompute
  56. 2026-08-28 17:11 UTCEG score recomputeFirst assessed: 4.3 MEDIUM

Related CVEs(same product + same CWE)

Same product

3 shown

Go:github.com/pocket-id/pocket-id/backend

Frequently asked(5)

What is CVE-2026-55834?
CVE-2026-55834 is a medium-severity vulnerability; its CVE record was published on August 28, 2026. Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to services. From 2.6.0 until 2.9.0, frontend/src/routes/authorize/+page.ts reads the redirecturi query parameter and frontend/src/routes/authorize/+page.svelte uses the raw callbackURL in redirectWithError when…
When was the CVE record for CVE-2026-55834 published?
The CVE record for CVE-2026-55834 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-2026-55834 actively exploited?
CVE-2026-55834 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55834?
CVE-2026-55834 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-2026-55834?
A fix for CVE-2026-55834 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55834 are linked in the Vendor Advisories panel on this page.

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