CVE-2026-63101

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-17. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-45202 (ENISA EUVD) · GHSA-ggm5-8rm7-3jgc (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (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: 0.5%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

The CVE record's CNA (VulnCheck) lists fossasia open-event-server versions up to and including 1.19.1 as affected. No release containing a fix is confirmed on record.

Open Event Server through 1.19.1 contains a missing authentication vulnerability that allows unauthenticated attackers to export the complete member roster of any group, including email addresses, names, join dates, and roles, by submitting requests to the group followers CSV export endpoint which lacks any authentication decorator. Attackers can enumerate sequential group IDs via brute-force, trigger an export via the unauthenticated POST endpoint, then poll the unauthenticated task status endpoint until completion to retrieve a download URL containing the full member CSV.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

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)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 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.
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 public PoC (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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
44th
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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 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 2026-10-27). 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).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (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

July 17, 2026

Last Modified

October 24, 2026

Advisory Details (2)

Auto-updated Jul 17, 2026
No fix on record yet.
Web page

Open Event Server 1.19.1 Unauthenticated Member Roster Export via CSV Export Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/open-event-server-unauthenticated-member-roster-export-via-csv-export-endpoint
Web page

oss/open-event-server.md at main · geo-chen/oss · GitHub

https://github.com/geo-chen/oss/blob/main/open-event-server.md

Vendor Advisories for CVE-2026-63101(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 12× in last 7d / 44× 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 253 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 153 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-27 21:04 UTCEG score recompute
  5. 2026-10-27 21:04 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  6. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-25 14:13 UTCEG score recompute
  10. 2026-10-24 20:27 UTCEG score recompute
  11. 2026-10-24 20:27 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  12. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-20 18:52 UTCEG score recompute
  17. 2026-10-20 18:52 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-10-18 03:23 UTCEG score recompute
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  24. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
Show 75 more
  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-13 12:04 UTCEG score recompute
  3. 2026-10-13 12:04 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-10-12 15:49 UTCEG score recompute
  6. 2026-10-11 19:33 UTCEG score recompute
  7. 2026-10-11 16:48 UTCEG score recompute
  8. 2026-10-11 14:10 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-10-01 10:29 UTCEG score recompute
  21. 2026-10-01 10:29 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-09-28 07:53 UTCEG score recompute
  25. 2026-09-28 07:53 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  26. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  27. 2026-09-24 04:35 UTCEG score recompute
  28. 2026-09-24 04:35 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  29. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  30. 2026-09-23 02:28 UTCEG score recompute
  31. 2026-09-23 02:28 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  32. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  33. 2026-09-18 04:33 UTCEG score recompute
  34. 2026-09-18 04:33 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  35. 2026-09-17 10:15 UTCEG score recompute
  36. 2026-09-17 10:15 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  37. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  38. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  39. 2026-09-14 03:13 UTCEG score recompute
  40. 2026-09-14 03:13 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  41. 2026-09-13 16:24 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  42. 2026-09-13 05:19 UTCEG score recompute
  43. 2026-09-13 05:19 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  44. 2026-09-12 10:29 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  45. 2026-09-11 21:06 UTCEG score recompute
  46. 2026-09-11 21:06 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  47. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  48. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  49. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  50. 2026-09-08 00:00 UTCEG score recompute
  51. 2026-09-08 00:00 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  52. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  53. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  54. 2026-09-06 13:22 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  55. 2026-09-05 20:27 UTCEG score recompute
  56. 2026-09-05 20:27 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  57. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  58. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  59. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  60. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  61. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  62. 2026-08-31 02:40 UTCEG score recompute
  63. 2026-08-31 02:40 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  64. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  65. 2026-08-30 15:48 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  66. 2026-08-30 03:18 UTCEG score recompute
  67. 2026-08-30 03:18 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  68. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  69. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  70. 2026-08-27 23:04 UTCEG score recompute
  71. 2026-08-27 23:04 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  73. 2026-08-27 12:14 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-08-26 22:38 UTCEG score recompute
  75. 2026-08-26 22:37 UTCGHSA enrichmentGHSA-ggm5-8rm7-3jgc · GitHub severity HIGH · GitHub CVSS 7.5

Frequently asked(5)

What is CVE-2026-63101?
CVE-2026-63101 is a high-severity vulnerability; its CVE record was published on July 17, 2026. Open Event Server through 1.19.1 contains a missing authentication vulnerability that allows unauthenticated attackers to export the complete member roster of any group, including email addresses, names, join dates, and roles, by submitting requests to the group followers CSV export endpoint which…
When was CVE-2026-63101 made public?
CVE-2026-63101 was made public on July 16, 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 July 17, 2026. EchelonGraph's copy of the record carries a last-modified date of October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-63101 actively exploited?
CVE-2026-63101 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63101?
CVE-2026-63101 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63101?
No fix for CVE-2026-63101 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (VulnCheck) lists fossasia open-event-server versions up to and including 1.19.1 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-63101 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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