CVE-2026-82287

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

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

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. The CNA's CVSS baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Rybbit before 2.7.0 contains a CORS misconfiguration vulnerability that allows attackers to bypass origin restrictions by reflecting any request origin in Access-Control-Allow-Origin responses while credentials are enabled. Attackers can issue credentialed cross-origin requests from any website to read analytics data, account information, and perform authenticated state-changing operations as the victim user.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
52
EG Risk 52/100

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)
Severity81% × 45%
Impact severity (EG Severity): CVSS 8.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
42nd
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 (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.

EG Severity
8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-19). 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; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days 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; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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 24, 2026

Advisory Details (5)

Auto-updated Aug 28, 2026
Patch available. Sources: github_commit.
Web page

Rybbit Reflects Any Origin in CORS Responses While Allowing Credentials | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rybbit-reflects-any-origin-in-cors-responses-while-allowing-credentials
GitHub commit Patch Available

commit 6f1039bdd332 (rybbit-io/rybbit)

Patch available: rybbit-io/rybbit v2.7.0 (contains commit 6f1039bdd332)

https://github.com/rybbit-io/rybbit/commit/6f1039bdd3328a84d6700031bc0ce4714020e2f9
Web page

rybbit/server/src/index.ts at v2.6.0 · rybbit-io/rybbit · GitHub

https://github.com/rybbit-io/rybbit/blob/v2.6.0/server/src/index.ts
Web page

GitHub - rybbit-io/rybbit: 🐸 Rybbit - open-source and privacy-friendly alternative to Google Analytics that is 10x more intuitive. · GitHub

https://github.com/rybbit-io/rybbit
Web page

CORS misconfiguration + SameSite=None cookies enable cross-origin CSRF · Issue #1038 · rybbit-io/rybbit · GitHub

https://github.com/rybbit-io/rybbit/issues/1038

Vendor Advisories for CVE-2026-82287(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 92× 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 100 of 191 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. None are among the latest 100 rows. The 91 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-20 07:48 UTCEG score recompute
  4. 2026-10-20 07:48 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  5. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-10-18 03:08 UTCEG score recompute
  8. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-13 06:06 UTCEG score recompute
  14. 2026-10-13 06:05 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  15. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  16. 2026-10-12 14:55 UTCEG score recompute
  17. 2026-10-11 19:20 UTCEG score recompute
  18. 2026-10-11 16:36 UTCEG score recompute
  19. 2026-10-11 13:54 UTCEG score recompute
  20. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  21. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  22. 2026-10-10 12:21 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  23. 2026-10-10 00:51 UTCEG score recompute
  24. 2026-10-10 00:51 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  25. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 41st percentile
Show 75 more
  1. 2026-10-09 02:40 UTCEG score recompute
  2. 2026-10-09 02:39 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  3. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  4. 2026-10-08 00:52 UTCEG score recompute
  5. 2026-10-08 00:52 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  6. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  7. 2026-10-07 06:43 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  8. 2026-10-06 19:12 UTCEG score recompute
  9. 2026-10-06 19:12 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  10. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-10-06 07:28 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  12. 2026-10-05 18:36 UTCEG score recompute
  13. 2026-10-05 18:35 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  14. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  15. 2026-10-05 07:06 UTCEG score recompute
  16. 2026-10-05 07:06 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  18. 2026-10-04 19:36 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  19. 2026-10-04 05:19 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  20. 2026-10-03 17:49 UTCEG score recompute
  21. 2026-10-03 17:49 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  22. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  23. 2026-10-03 06:20 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  24. 2026-10-02 18:50 UTCEG score recompute
  25. 2026-10-02 18:50 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  26. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  27. 2026-10-02 07:18 UTCEG score recompute
  28. 2026-10-02 07:18 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  29. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  30. 2026-10-01 19:49 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  31. 2026-10-01 07:18 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  32. 2026-09-30 19:49 UTCEG score recompute
  33. 2026-09-30 19:49 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  34. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  35. 2026-09-30 03:50 UTCEG score recompute
  36. 2026-09-30 03:49 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  37. 2026-09-29 08:38 UTCEG score recompute
  38. 2026-09-29 08:38 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  39. 2026-09-28 21:09 UTCEG score recompute
  40. 2026-09-28 21:09 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  41. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  42. 2026-09-28 07:03 UTCEG score recompute
  43. 2026-09-28 07:03 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  44. 2026-09-27 19:28 UTCEG score recompute
  45. 2026-09-27 19:28 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  46. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  47. 2026-09-27 07:54 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  48. 2026-09-26 20:24 UTCEG score recompute
  49. 2026-09-26 20:24 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  50. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  51. 2026-09-26 08:06 UTCEG score recompute
  52. 2026-09-26 08:06 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  53. 2026-09-25 14:12 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  54. 2026-09-25 02:27 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  55. 2026-09-24 14:57 UTCEG score recompute
  56. 2026-09-24 14:57 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  57. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  58. 2026-09-24 04:55 UTCEG score recompute
  59. 2026-09-24 04:54 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  60. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  61. 2026-09-23 17:24 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  62. 2026-09-23 05:46 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  63. 2026-09-22 18:17 UTCEG score recompute
  64. 2026-09-22 18:17 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  65. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  66. 2026-09-22 06:32 UTCEG score recompute
  67. 2026-09-22 06:32 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  68. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  69. 2026-09-21 19:02 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  70. 2026-09-21 07:32 UTCEG score recompute
  71. 2026-09-21 07:32 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  72. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  73. 2026-09-20 19:47 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  74. 2026-09-20 08:15 UTCGHSA enrichmentGHSA-phf4-3733-pwc6 · GitHub severity HIGH · GitHub CVSS 8.1
  75. 2026-09-19 18:53 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-82287?
CVE-2026-82287 is a high-severity vulnerability; its CVE record was published on August 28, 2026. Rybbit before 2.7.0 contains a CORS misconfiguration vulnerability that allows attackers to bypass origin restrictions by reflecting any request origin in Access-Control-Allow-Origin responses while credentials are enabled. Attackers can issue credentialed cross-origin requests from any website to…
When was CVE-2026-82287 made public?
CVE-2026-82287 was made public on July 3, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 28, 2026. EchelonGraph's copy of the record carries a last-modified date of September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-82287 actively exploited?
CVE-2026-82287 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-82287?
CVE-2026-82287 has a CVSS base score of 8.1 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-82287?
A fix for CVE-2026-82287 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-82287 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-82287

Explore →

Is Your Infrastructure Affected by CVE-2026-82287?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.