CVE-2026-45273

HIGHPre-NVD 8.78.7
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (37th 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
8.7EG
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).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.7Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

MyBooks is an ebook management web server also known as Talebook. In 3.41.2 and earlier, the AdminSettings.post handler for POST /api/admin/settings in webserver/handlers/admin.py applies the auth decorator but does not check the self.admin_user property, unlike the corresponding GET handler. Any authenticated regular user can therefore overwrite server configuration values including SMTP credentials, OAuth client secrets, storage paths, security feature flags, and autoreload settings. The process_auth_header function in webserver/handlers/base.py also fails to verify the matched account's active flag, allowing a registered but unactivated account to authenticate and reach the vulnerable handler. Exploitation can disclose secrets through configuration access paths, sabotage application behavior, force service restarts, and supply the settings needed for related code-injection attacks. This issue is fixed in version 3.42.0.

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
55
EG Risk 55/100

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)
Severity87% × 45%
The EG Score, 8.7 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, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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
0.4%
EPSS %ILE
37th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

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

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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 19, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 19, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

v3.42.0

Patch available: PoxenStudio/mybooks 3.42.0

https://github.com/PoxenStudio/mybooks/releases/tag/3.42.0
GitHub commit Patch Available

commit a1780c98b005 (PoxenStudio/mybooks)

Patch available: PoxenStudio/mybooks 3.42.0 (contains commit a1780c98b005)

https://github.com/PoxenStudio/mybooks/commit/a1780c98b00566af7da2fc099fe38500efc02e92
GitHub advisoryMentions a patch (unverified)

Privilege Escalation via Missing Authorization on Admin Settings Endpoint · Advisory · PoxenStudio/mybooks · GitHub

https://github.com/PoxenStudio/mybooks/security/advisories/GHSA-354j-9hx8-3p45

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 48× 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% · 37th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  3. 2026-10-12 16:04 UTCEG score recompute
  4. 2026-10-11 19:46 UTCEG score recompute
  5. 2026-10-11 17:01 UTCEG score recompute
  6. 2026-10-11 14:26 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  11. 2026-10-08 08:30 UTCEG score recompute
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  13. 2026-10-06 21:23 UTCEG score recompute
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  15. 2026-10-06 07:59 UTCEG score recompute
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-10-05 10:07 UTCEG score recompute
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-10-03 16:58 UTCEG score recompute
  20. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  21. 2026-10-03 01:40 UTCEG score recompute
  22. 2026-10-01 22:58 UTCEG score recompute
  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  24. 2026-09-30 21:36 UTCEG score recompute
  25. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 36th percentile
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  1. 2026-09-30 08:49 UTCEG score recompute
  2. 2026-09-28 21:43 UTCEG score recompute
  3. 2026-09-27 20:11 UTCEG score recompute
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  5. 2026-09-27 07:02 UTCEG score recompute
  6. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  7. 2026-09-25 00:54 UTCEG score recompute
  8. 2026-09-23 21:18 UTCEG score recompute
  9. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-09-22 19:57 UTCEG score recompute
  11. 2026-09-22 07:16 UTCEG score recompute
  12. 2026-09-21 05:54 UTCEG score recompute
  13. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-09-20 03:03 UTCEG score recompute
  15. 2026-09-19 01:39 UTCEG score recompute
  16. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-09-18 00:12 UTCEG score recompute
  18. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-09-16 22:48 UTCEG score recompute
  20. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-09-16 09:52 UTCEG score recompute
  22. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-09-15 07:59 UTCEG score recompute
  24. 2026-09-14 05:06 UTCEG score recompute
  25. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  26. 2026-09-12 15:04 UTCEG score recompute
  27. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  28. 2026-09-12 02:22 UTCEG score recompute
  29. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  30. 2026-09-11 13:41 UTCEG score recompute
  31. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  32. 2026-09-10 12:19 UTCEG score recompute
  33. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  34. 2026-09-09 02:39 UTCEG score recompute
  35. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  36. 2026-09-07 17:39 UTCEG score recompute
  37. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  38. 2026-09-06 16:18 UTCEG score recompute
  39. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  40. 2026-09-06 03:37 UTCEG score recompute
  41. 2026-09-05 02:14 UTCEG score recompute
  42. 2026-09-04 13:34 UTCEG score recompute
  43. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  44. 2026-09-02 22:51 UTCEG score recompute
  45. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  46. 2026-09-01 21:16 UTCEG score recompute
  47. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  48. 2026-09-01 08:36 UTCEG score recompute
  49. 2026-08-31 04:46 UTCEG score recompute
  50. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  51. 2026-08-30 03:24 UTCEG score recompute
  52. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  53. 2026-08-29 02:01 UTCEG score recompute
  54. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  55. 2026-08-27 18:48 UTCEG score recompute
  56. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  57. 2026-08-26 16:14 UTCEG score recompute
  58. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  59. 2026-08-25 14:49 UTCEG score recompute
  60. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  61. 2026-08-25 02:08 UTCEG score recompute
  62. 2026-08-24 13:28 UTCEG score recompute
  63. 2026-08-23 12:07 UTCEG score recompute
  64. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  65. 2026-08-22 10:44 UTCEG score recompute
  66. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  67. 2026-08-21 09:22 UTCEG score recompute
  68. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  69. 2026-08-19 19:20 UTCEG score recompute
  70. 2026-08-19 18:38 UTCEG score recompute
  71. 2026-08-19 15:24 UTCEG score recompute
  72. 2026-08-19 14:57 UTCEG score recomputeFirst assessed: 8.7 HIGH
  73. 2026-08-19 14:57 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-45273?
CVE-2026-45273 is a high-severity vulnerability; its CVE record was published on August 19, 2026. MyBooks is an ebook management web server also known as Talebook. In 3.41.2 and earlier, the AdminSettings.post handler for POST /api/admin/settings in webserver/handlers/admin.py applies the auth decorator but does not check the self.adminuser property, unlike the corresponding GET handler. Any…
When was the CVE record for CVE-2026-45273 published?
The CVE record for CVE-2026-45273 was published on August 19, 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-2026-45273 actively exploited?
CVE-2026-45273 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-45273?
CVE-2026-45273 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-45273?
A fix for CVE-2026-45273 is available: update to the fixed version the vendor names in its advisory.

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